Sandstone (Weathered Cobble)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
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Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Unakite (Epidotized Granite)
Epidotized Granite (composed of Epidote, Orthoclase, and Quartz)
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Slate
Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.
sedimentary
Garnet Gneiss
Gneiss containing almandine-pyrope garnet
metamorphic
Sapphirine in Matrix
Sapphirine (Mg,Al)8(Al,Si)6O20
mineral
Red Sandstone
Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)
sedimentary
Granite and Igneous Mix
Phaneritic Felsic to Mafic Intrusive Rocks
igneous
Diamond
Diamond (pure Carbon, C)
mineral
Quartz Vein in Schist
Quartz (SiO2) in Pelitic Schist
metamorphic
Petrified Wood
Silicified wood (Quartz, SiO2)
metamorphic
Basalt with Quartz Veining
Veined Basalt (composed primarily of plagioclase feldspar, pyroxene, and olivine with quartz/calcite infill)
igneous
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Schist (Kyanite Schist)
Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)
metamorphic
Clear Quartz Crystal
Quartz (Silicon Dioxide - SiO2)
mineral
Mixed Tumbled Stones Collection
Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)
multiple
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Banded Marble
Recrystallized Calcite (CaCO3)
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
metamorphic
Gneiss
Gneiss
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Epidote
Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Conglomerate
Conglomerate
Sedimentary Rock
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Gneiss
Gneiss (a rock type, not a specific mineral with a formula)
Metamorphic Rock
Epidote
Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Basalt (Vesicular or Porphyritic)
Basalt (composed primarily of plagioclase feldspar, pyroxene, and olivine)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive volcanic rock)
igneous
Granite / Gneiss Complex
Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)
igneous/metamorphic
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Milky Quartz with Country Rock contact
Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock
mineral
Green Schist
Greenschist
metamorphic
Yellow Aventurine
Silicon Dioxide (Quartz with inclusions), SiO2
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminum)
mineral
Gneiss
Foliated Metamorphic Gneiss
metamorphic